I need help! Will give high amount of points, 5 stars and brainiest if you help me get it right. Must explain how you got your answer I have to show my work (thanks).

Answer:
9. Supplementary (angles adds to 180)
10. complementary (angles add to 90)
11.
6x+4=10x
/6x
4=4x
x=1
12.
8+7
90/15
x=6
Answer:
9. Supplementary Angle
10. Complementary Angle
11. Supplementary Angle
12. Complementary Angle
Step-by-step explanation:
I don't know how to solve the xs, but Supplementary angles means two angles that add to equal 180 degrees. And Complementary angles means two angles that add to equal 90 degrees.